Emissivity calibration method for pyrometer measurement of melting pool temperature in selective laser melting of stainless steel 316L

Chi Guang Ren, Yu-Lung Lo, Hong Chuong Tran, Min Hsun Lee

研究成果: Article

摘要

Selective laser melting (SLM) is an additive manufacturing (AM) technique for producing arbitrary work pieces, in which a laser beam is controlled to melt specific regions of a metal powder bed layer by layer so as to build up the required geometric form. In the present study, a method is proposed for calibrating the measurements obtained by a pyrometer for the melting pool temperature in the SLM of stainless steel 316L powder using the estimated values of the emissivity coefficients obtained from finite element heat transfer simulation and experimental tests. The accuracy in temperature prediction by heat transfer simulation is also confirmed by embedding a thermocouple into the powder bed. As a result, the calibration process is applicable to both one-color and two-color pyrometry methods. It is shown that the average error between the temperature measurements obtained from the calibrated pyrometer and the simulated temperature is just 1%. In other words, the feasibility of the proposed emissivity-based calibration method is confirmed. In the author’s knowledge, this is the first proposed idea to calibrate the emissivity of the pyrometer based upon the simulation model for accurately extracting the true melting pool temperature.

原文English
期刊International Journal of Advanced Manufacturing Technology
DOIs
出版狀態Accepted/In press - 2019 一月 1

指紋

Pyrometers
Melting
Stainless steel
Calibration
Lasers
3D printers
Pyrometry
Heat transfer
Color
Powders
Temperature
Powder metals
Thermocouples
Temperature measurement
Laser beams

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Software
  • Mechanical Engineering
  • Computer Science Applications
  • Industrial and Manufacturing Engineering

引用此文

@article{ae234152e49a4057a943a28d1f3fbb4d,
title = "Emissivity calibration method for pyrometer measurement of melting pool temperature in selective laser melting of stainless steel 316L",
abstract = "Selective laser melting (SLM) is an additive manufacturing (AM) technique for producing arbitrary work pieces, in which a laser beam is controlled to melt specific regions of a metal powder bed layer by layer so as to build up the required geometric form. In the present study, a method is proposed for calibrating the measurements obtained by a pyrometer for the melting pool temperature in the SLM of stainless steel 316L powder using the estimated values of the emissivity coefficients obtained from finite element heat transfer simulation and experimental tests. The accuracy in temperature prediction by heat transfer simulation is also confirmed by embedding a thermocouple into the powder bed. As a result, the calibration process is applicable to both one-color and two-color pyrometry methods. It is shown that the average error between the temperature measurements obtained from the calibrated pyrometer and the simulated temperature is just 1{\%}. In other words, the feasibility of the proposed emissivity-based calibration method is confirmed. In the author’s knowledge, this is the first proposed idea to calibrate the emissivity of the pyrometer based upon the simulation model for accurately extracting the true melting pool temperature.",
author = "Ren, {Chi Guang} and Yu-Lung Lo and Tran, {Hong Chuong} and Lee, {Min Hsun}",
year = "2019",
month = "1",
day = "1",
doi = "10.1007/s00170-019-04193-0",
language = "English",
journal = "International Journal of Advanced Manufacturing Technology",
issn = "0268-3768",
publisher = "Springer London",

}

TY - JOUR

T1 - Emissivity calibration method for pyrometer measurement of melting pool temperature in selective laser melting of stainless steel 316L

AU - Ren, Chi Guang

AU - Lo, Yu-Lung

AU - Tran, Hong Chuong

AU - Lee, Min Hsun

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Selective laser melting (SLM) is an additive manufacturing (AM) technique for producing arbitrary work pieces, in which a laser beam is controlled to melt specific regions of a metal powder bed layer by layer so as to build up the required geometric form. In the present study, a method is proposed for calibrating the measurements obtained by a pyrometer for the melting pool temperature in the SLM of stainless steel 316L powder using the estimated values of the emissivity coefficients obtained from finite element heat transfer simulation and experimental tests. The accuracy in temperature prediction by heat transfer simulation is also confirmed by embedding a thermocouple into the powder bed. As a result, the calibration process is applicable to both one-color and two-color pyrometry methods. It is shown that the average error between the temperature measurements obtained from the calibrated pyrometer and the simulated temperature is just 1%. In other words, the feasibility of the proposed emissivity-based calibration method is confirmed. In the author’s knowledge, this is the first proposed idea to calibrate the emissivity of the pyrometer based upon the simulation model for accurately extracting the true melting pool temperature.

AB - Selective laser melting (SLM) is an additive manufacturing (AM) technique for producing arbitrary work pieces, in which a laser beam is controlled to melt specific regions of a metal powder bed layer by layer so as to build up the required geometric form. In the present study, a method is proposed for calibrating the measurements obtained by a pyrometer for the melting pool temperature in the SLM of stainless steel 316L powder using the estimated values of the emissivity coefficients obtained from finite element heat transfer simulation and experimental tests. The accuracy in temperature prediction by heat transfer simulation is also confirmed by embedding a thermocouple into the powder bed. As a result, the calibration process is applicable to both one-color and two-color pyrometry methods. It is shown that the average error between the temperature measurements obtained from the calibrated pyrometer and the simulated temperature is just 1%. In other words, the feasibility of the proposed emissivity-based calibration method is confirmed. In the author’s knowledge, this is the first proposed idea to calibrate the emissivity of the pyrometer based upon the simulation model for accurately extracting the true melting pool temperature.

UR - http://www.scopus.com/inward/record.url?scp=85070902934&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85070902934&partnerID=8YFLogxK

U2 - 10.1007/s00170-019-04193-0

DO - 10.1007/s00170-019-04193-0

M3 - Article

AN - SCOPUS:85070902934

JO - International Journal of Advanced Manufacturing Technology

JF - International Journal of Advanced Manufacturing Technology

SN - 0268-3768

ER -